I just bought a 1987 420 sel and it is fuel fouling the plugs replaced plugs and started it it ran for a little but it now does not start the plugs are soaked in fuel not oil I need help took it to serveral shops and everyone of them keep giving me the run arounf I have done a lot of work to these veh some shops say replaced the primary fuel pressure regulator one said replace the fuel distutor one said replace the warm up regulator but no one came give me a sure anwser please some help!!!